This heavy duty air purifier features a four stage four-Stage filter assembly and these are Activated Carbon filter, HEPA filter, VOC filter and TiO2 filter with UV Light . It is targeted to effectively remove volatile organic compounds (VOCs), odors and harmful particles, for rooms up to 465 sq.ft. Both HEPA and VOC filters are designed to operate continuously for up to 2,000 hours.The VOC filter in this unit effectively removes formaldehye, tolulene and VOCs while theTiO2 filter with UV light breaks the pollutant down into harmless carbon dioxide and water molecules. This unit comes with reemote control and also features 4 fan speeds, 1-8 hour timer and casters for portability.